EP 1128045 A2 20010829 - Engine air-fuel ratio controller
Title (en)
Engine air-fuel ratio controller
Title (de)
Luft-Kraftstoff-Verhältnis-Steuerungssystem
Title (fr)
Système de commande de rapport air-carburant
Publication
Application
Priority
- JP 2000046098 A 20000223
- JP 2000046104 A 20000223
Abstract (en)
A catalyst 3 which has oxygen storage performance is installed in an engine exhaust passage 2, an oxygen storage amount is estimated based on the output of an upstream air-fuel ratio sensor 4 installed in the upstream of the catalyst 3, and an air-fuel ratio is controlled so that this oxygen storage amount coincides with a target value. When the output of a downstream air-fuel ratio sensor 5 has become lean or rich for longer than a fixed time, the output of the upstream air-fuel ratio sensor 4 is corrected based on the output of the downstream air-fuel ratio sensor 5 placed in the downstream of the catalyst 3. In this way, the output fluctuation due to deterioration of the air-fuel ratio sensor 4 upstream of the catalyst is corrected, and the catalyst oxygen storage amount is always precisely controlled to the target value. <IMAGE>
IPC 1-7
IPC 8 full level
F02D 41/02 (2006.01); F02D 41/14 (2006.01); F02D 41/24 (2006.01)
CPC (source: EP US)
F02D 41/0295 (2013.01 - EP US); F02D 41/1441 (2013.01 - EP US); F02D 41/2454 (2013.01 - EP US); F02D 41/2474 (2013.01 - EP US); F01N 2570/16 (2013.01 - EP US); F02D 41/1456 (2013.01 - EP US); F02D 41/2441 (2013.01 - EP US); F02D 2200/0814 (2013.01 - EP US)
Citation (applicant)
- JP H05195842 A 19930803 - BOSCH GMBH ROBERT
- JP H07259602 A 19951009 - HONDA MOTOR CO LTD
Designated contracting state (EPC)
DE FR GB
DOCDB simple family (publication)
EP 1128045 A2 20010829; EP 1128045 A3 20030910; EP 1128045 B1 20051228; DE 60116158 D1 20060202; DE 60116158 T2 20060629; US 2001045089 A1 20011129; US 6494038 B2 20021217
DOCDB simple family (application)
EP 01104307 A 20010222; DE 60116158 T 20010222; US 79089901 A 20010223